Feat: Add Create User testcase for DB testcases

[ramu-nukavarapu]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

• Add Create User testcase using playwright for DB testcases

Issue being fixed

Fixes #22134

Please indicate you've done the following:

• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[ramu-nukavarapu]

tagging @bupd for review